99. The construction, improvement or repair of a bridge or a culvert must be carried out in a manner that ensures its stability and operation regardless of the period the work is carried out and the work methods used. The stabilization of the bridge or culvert must be done as the work progresses and any defect must be corrected as soon as it is detected.
The fill must be compacted in successive layers up to above the conduit or arch.
To ensure the durability of the culvert, special measures must be taken to ensure compaction and an adequate stabilization when materials used are frozen.
Every person authorized to build or improve a culvert who builds or improves the culvert from 15 December to 31 March must inspect the culvert after the spring flood and correct any defect within 7 days after the inspection. The foregoing also applies to a person who repairs a culvert during that period. The inspection must be carried out not later than 30 June following that period.